from jack the ripper to john wayne gave see, murders who seem to chose their victims at random fascinate and terrify us. it was the disappearance of an 18-year-old alaskan girl that led to police unravel one such killer's astounding 11-year killing spree. neal karlinsky brings us the chilling details for our series, "crime and punishment." >> reporter: you're watching 34-year-old israel keyes describe over coffee and a bagel his strategy for hunting and killing innocent people. >> back when i was smart, i would let them come to me. just a remote area. kind of go to a remote area that's not anywhere near where you live. but that other people go to, as well. >> reporter: the police interrogation is in anchorage, alaska, where keyes was being held for the killing of samantha koenig, seen her putting her hands up the very moment a masked keyes pulls a gun on her. he leads her away from the coffee stand, telling police he killed her and left to take a cruise out of new orleans before asking her family for ransom. gruesome as it is, keyes wasn't done talking. in fact, the man who matter of fac